Sounds like Dragon's Breath if it was a special ammo grenade launcher. It's an interesting idea. Though in my opinion, Burning Ambition sounds almost too good for that kind of weapon. That seems like the kind of situation where Burning Ambition on Area Denials would probably be tuned to inflict less scorch to balance out the weapon with the massive number of damage ticks the weapon itself could cause. I could probably see it working where shooting it at a stand-still boss could be enough to cause the boss to ignite and have almost enough extra damage ticks to start scorching the boss again, though maybe it could be fine to let it last long enough to actually start scorching again in one burst. Though I think if it were able to cause said boss to ignite more than once in a single burst without other scorch factors, that would probably be too much.